Fahrenheit to Kelvin Converter (°F to K)
Convert Fahrenheit to Kelvin (°F to K). See results in Kelvin, Celsius, and Rankine. Includes a quick reference table from absolute zero to oven temperatures.
TEMPERATURE IN KELVIN
295.37 K
CELSIUS
22.22 °C
RANKINE
531.67 °R
ABS ZERO?
✅ Above
FORMULA
(72−32)×⅝+273
Fahrenheit to Kelvin — Quick Reference
| °F | K | °C | Context |
|---|---|---|---|
| -459.67°F | 0.00 K | -273.1°C | Absolute zero |
| -40°F | 233.15 K | -40.0°C | F = C crossover |
| 0°F | 255.37 K | -17.8°C | Cold winter |
| 32°F | 273.15 K | 0.0°C | Water freezes |
| 68°F | 293.15 K | 20.0°C | Room temp (20°C) |
| 72°F | 295.37 K | 22.2°C | Room temp (22°C) |
| 98.6°F | 310.15 K | 37.0°C | Body temperature |
| 100°F | 310.93 K | 37.8°C | Hot summer day |
| 212°F | 373.15 K | 100.0°C | Water boils |
| 350°F | 449.82 K | 176.7°C | Oven: baking |
| 400°F | 477.59 K | 204.4°C | Oven: roasting |
| 450°F | 505.37 K | 232.2°C | Oven: pizza |
| 500°F | 533.15 K | 260.0°C | Oven: max |
| 1000°F | 810.93 K | 537.8°C | Red-hot metal |
How to Convert Fahrenheit to Kelvin
First convert to Celsius, then add 273.15:
Example: 72°F (room temperature)
= (72 − 32) × 5/9 + 273.15 = 22.22 + 273.15 = 295.37 K
Example: 32°F (water freezes)
= (32 − 32) × 5/9 + 273.15 = 0 + 273.15 = 273.15 K
Example: -459.67°F (absolute zero)
= (-459.67 − 32) × 5/9 + 273.15 = -273.15 + 273.15 = 0 K
Fahrenheit to Kelvin — Conversion Chart
| °F | K | °C | Significance |
|---|---|---|---|
| -459.67°F | 0 K | -273.15°C | Absolute zero |
| -40°F | 233.15 K | -40°C | F = C crossover |
| 0°F | 255.37 K | -17.78°C | Very cold winter day |
| 32°F | 273.15 K | 0°C | Water freezes |
| 68°F | 293.15 K | 20°C | Room temperature |
| 98.6°F | 310.15 K | 37°C | Body temperature |
| 212°F | 373.15 K | 100°C | Water boils |
| 450°F | 505.37 K | 232.2°C | Oven: pizza |
| 1000°F | 810.93 K | 537.8°C | Red-hot metal |
What Is Absolute Zero?
Absolute zero (0 K = -459.67°F = -273.15°C) is the lowest possible temperature. At absolute zero, molecular motion theoretically stops completely. The Third Law of Thermodynamics states that reaching exactly 0 K is physically impossible, though scientists have cooled materials to within billionths of a degree.
For Americans, -459.67°F is hard to visualize — it's 460 degrees below zero Fahrenheit, or about 500°F colder than the coldest temperature ever recorded on Earth (-128.6°F in Antarctica).
Notable Temperatures in Science
| Event | K | °F | °C |
|---|---|---|---|
| Absolute zero | 0 K | -459.67°F | -273.15°C |
| Liquid nitrogen boils | 77 K | -320.4°F | -196°C |
| Dry ice sublimes | 195 K | -109.3°F | -78.5°C |
| Water's triple point | 273.16 K | 32.02°F | 0.01°C |
| Human body | 310.15 K | 98.6°F | 37°C |
| Water boils | 373.15 K | 212°F | 100°C |
| Iron melts | 1811 K | 2800°F | 1538°C |
| Sun's surface | 5778 K | 9941°F | 5505°C |
Where Americans Encounter Kelvin
| Context | Kelvin Value | What It Means |
|---|---|---|
| Light bulb packaging | 2700K – 6500K | Color temperature: warm (2700K) to daylight (6500K) |
| Photography / video | 3200K – 5600K | White balance: tungsten (3200K) to daylight (5600K) |
| LED smart bulbs | 2000K – 6500K | Adjustable color temperature range |
| Science class (AP/college) | Various | Gas laws (PV = nRT), thermodynamics |
| Weather science | Various | Blackbody radiation, atmospheric science |
What Is Fahrenheit?
Fahrenheit (°F) is a temperature scale used primarily in the United States. Water freezes at 32°F and boils at 212°F. It was developed by Daniel Gabriel Fahrenheit in 1724.
What Is Kelvin?
Kelvin (K) is the SI base unit of temperature used in science worldwide. It starts at absolute zero (0 K) — the coldest possible temperature. Each kelvin is the same size as one degree Celsius, but the scale starts at absolute zero instead of water's freezing point. Note: Kelvin uses no degree symbol — it's "295 K" not "295°K".